“When you go back and you look at the actual documents, many people have said since then that it was about states' rights, but really the only significant state right that people were arguing about in 1860 was the right to own what was known as slave property — property and slaves unimpeded — and to be able to travel with that property anywhere that you wanted to. So it's clear that this was really about slavery in almost every significant way, but we've sort of pushed that to the side because of course we want to believe that our country is a country that's always stood for freedom. And ... certainly it's difficult for some Southern Americans to accept that their ancestors fought a war on behalf of slavery. And I think that Northerners really, for the cause of national reconciliation, decided to push that aside — decided to accept Southerners' denials or demurrals.”